John ham



(No Model.)

J. HAM.

BOILER PURNAUE.

No. 354,057. Patented Dec. 7, 1886.

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, I IIIIIIII'IIIIIIII'I/ E g. s WJTNES SES 1 INVENTOR J 4 Kira/53M v .zi- 1 g Q M J4 5n ATTORNEYS NITED STATES PATENT OFFICE.

JOHN HAM, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE HAM COAL SAVINGCOMPANY, OF NEWV YORK, N. Y.

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 354,057, dated December7, 1886.

Application filed April 15, 1886. Serial No. 199,018. (No model.)

To all whom it may concern.-

Be it known that I, JOHN HAM, a citizen of the United States, residingat Brooklyn, in the county of Kings and State of New York, have inventednew and useful Improvements in Boiler-Furnaces, of which the followingis a specification.

This invention has for its object to provide a novel device forsupplying heated air to air-distributors situated in the fire-chamberabove the grate-bars. the construction of said device being pointed outin the following specification and claims, and illustrated in theaccompanying drawings, in which- Figure 1 represents a sectional frontview. Fig. 2 is a sectional side view in the plane a: m, Fig. 1. Fig. 3is a horizontal section in the plane y y, Flg. 2.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates a steatn-boiler extending overthe fire-chamber B and combustion-chamber O. The products of combustionpass, as indicated by the arrow in Fig. 2, from the fire-chamber throughthe flue-passage D, over the bridge wall E, through thecombustion-chantber to the rear of the boiler, thence through theholler-tines F into I the uptake-flue G, and thence through theconnecting uptake-pipe H into the smokeflue I, and thence to thechimney. (Not shown.) The fine extends above the boiler, and may serveas the due to two or more firechambers or furnaces, if desired. In thisexampletwofurnaces, each with its steam-boiler, are shown with the flueI arranged above.

Upon one side of the discharge-flue I is a chamber, J, formed in thisexample by riveting to the flue the flaring edges of a plate bentoutward so as to form an air space or chamber, J, between it and theside of the fine. The left-hand end of the flue I is closed, as is theleft hand of the-chamber J. The chamber J extends nearly to the otherend of the flue I,.and its right-hand end is open to admit the entranceinto it of the atmospheric air, which passes through it to theconnecting-pipe K, and through it to the return l hotair pipe L, whichextendsalong the front i of the air-chamber J nearly to its open end, oras far as the furnaces extend in that direction. The hot-air pipe L isclosed at both ends, and from it extend pipes M, which conduct the hotair from it down into air-distributers N, arranged in the fire-chamberor in the walls of the fire-chambers.

The air -distributers consist of boxes arranged in the fire-chambers,preferably in the side walls, extending from the front as far as ornearly to the bridge-walls, and perforated on the inner side, or theside nearest to the grate, with numerous holes, through which the hotair discharged into them through the airpipes M is distributed anddischarged into the fire-chamber.

By the means above described the products of combustion which pass intothe flue I are used to heat the air which passes through the air-chamberJ, so that when the current of air which enters that chamber at itsrighthand end reaches its other end and passes through theconnecting-pipe K into the pipe L it will have become more or lessheated, and consequently is in a. favorable condition as to temperaturefor being discharged into the furnace through the distributing-pipes Mand the perforated distributing boxes N. The operations of the furnaceare thus facilitated, and a more perfect combustion of the fuel and anincreased production of steam obtained than has been heretofore realizedin boilerfurnaces of this description, and these results are reachedwithoutarresting the discharge of the products of combustion orinjuriously interfering with the construction or proper operation of theapparatus.

What I claim as new, and desire to secure by Letters Patent, is-

l. The combination, with a boiler-furnace, and with air-distributerssituated in the firechamber thereof above the grate bars, of anair-heating chamber formed onthesmoke-fiue f and open at one end andclosed at its opposite end, a hot-air pipe which opens into theair-heating chatnber, near the closed end thereof. and branch pipesleading from the hot-air pipe to the air-distributers,substantially asshown and described.

2. The combination, with a boiler-furnace, and with air-distributorssituated in the side walls of the fire-chamber above the level ofthefire-grate,0fan air-heatingchamberformed In testimony whereof I havehereunto set on the smoke-flue and open attone end and my hand and sealin the presence of two subclosed at its opposite end, a hot-air pipeopenscribing witnesses.

ing intothe air-heating chamber near its closed JOHN HAM. s] 5 end, andbranch pipes leading from the hot- Witnesses:

air pipe to the air-distributer, substantially as W. HAUFF,

shown and described.

OTTO HUFELAND.

